/* Copyright (C) 1997, 1999, 2001, 2008 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>. */

/* Based on the FreeBSD version of this file. Curiously, that file
   lacks a copyright in the header. */

#ifndef __NET_ETHERNET_H
#define __NET_ETHERNET_H 1

#include <types.h>
#include <uapi/stdint.h>
#include <uapi/netinet/if_ether.h>

__BEGIN_DECLS

/* This is a name for the 48 bit ethernet address available on many systems.  */
struct ether_addr
{
  uint8_t ether_addr_octet[ETH_ALEN];
}
#ifdef __GNUC__
 __attribute__ ((__packed__))
#endif
;

/* 10Mb/s ethernet header */
struct ether_header
{
  uint8_t  ether_dhost[ETH_ALEN];  /* destination eth addr */
  uint8_t  ether_shost[ETH_ALEN];  /* source ether addr    */
  uint16_t ether_type;             /* packet type ID field */
}
#ifdef __GNUC__
 __attribute__ ((__packed__))
#endif
;

/* Ethernet protocol ID's */
#define ETHERTYPE_PUP       0x0200          /* Xerox PUP */
#define ETHERTYPE_SPRITE    0x0500      /* Sprite */
#define ETHERTYPE_IP        0x0800      /* IP */
#define ETHERTYPE_ARP       0x0806      /* Address resolution */
#define ETHERTYPE_REVARP    0x8035      /* Reverse ARP */
#define ETHERTYPE_AT        0x809B      /* AppleTalk protocol */
#define ETHERTYPE_AARP      0x80F3      /* AppleTalk ARP */
#define ETHERTYPE_VLAN      0x8100      /* IEEE 802.1Q VLAN tagging */
#define ETHERTYPE_IPX       0x8137      /* IPX */
#define ETHERTYPE_IPV6      0x86dd      /* IP protocol version 6 */
#define ETHERTYPE_LOOPBACK  0x9000      /* used to test interfaces */


#define ETHER_ADDR_LEN  ETH_ALEN                 /* size of ethernet addr */
#define ETHER_TYPE_LEN  2                        /* bytes in type field */
#define ETHER_CRC_LEN   4                        /* bytes in CRC field */
#define ETHER_HDR_LEN   ETH_HLEN                 /* total octets in header */
#define ETHER_MIN_LEN   (ETH_ZLEN + ETHER_CRC_LEN) /* min packet length */
#define ETHER_MAX_LEN   (ETH_FRAME_LEN + ETHER_CRC_LEN) /* max packet length */

/* make sure ethenet length is valid */
#define ETHER_IS_VALID_LEN(foo) \
    ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)

/*
 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
 * by an ETHER type (as given above) and then the (variable-length) header.
 */
#define ETHERTYPE_TRAIL     0x1000      /* Trailer packet */
#define ETHERTYPE_NTRAILER  16

#define ETHERMTU    ETH_DATA_LEN
#define ETHERMIN    (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)

__END_DECLS

#endif  /* net/ethernet.h */
